module.exports = app => {
    const mongoose = require('mongoose')
    mongoose.connect('mongodb://127.0.0.1:27017/lucky', { useNewUrlParser: true, useUnifiedTopology: true }, (err) => {
        if (err) {
            console.log(`数据库连接失败：${err}`)
        } else {
            console.log('数据库连接成功！')
        }
    })
}